Investigation 1: What Is The Unknown Metal Set Ba Metal Scra

Investigation 1 What Is The Unknown Metalset Ba Metal Scrap Yard Wan

Investigation 1: What is the Unknown Metal? Set B A metal scrap yard wants to recycle metals but needs to know the identity of the metal before sending it for recycling. In this investigation, you will determine a way to identify unknown metals using intensive properties. Density is an example of an intensive property that can be used to identify different metals. In this investigation, you will determine the identity of two unknown metal samples by calculating the density of each sample.

A group of students recorded the following information during the course of this investigation: Lab Notes Investigation Name: __What is the Unknown Metal?____ Date: 05/03/2016 Student Name: _____________________________________

Proposal We were given two unknown metals to identify. We decided to use density which is an intensive property to identify the different metals. An intensive property is one that does not depend on the amount of material present. Density is defined as mass divided by volume (D=m/V). We will first determine the mass by weighing each sample of the unknown metals.

We will also determine their Volume by measuring the amount of water displaced when each unknown metal is completely submerged in water. Data List of the materials we used for this investigation: -We were assigned Set B : Unknown II & Unknown IV -An electronic balance -100mL graduated cylinder -Water Each metal was observed and described, then the weight of each cylinder was taken and recorded on Table 1. Three trial were performed. Unknown I Unknown IV Description Reddish-orange, heavy weight metal Metallic brownish, heavy weight metal Table 1: Unknowns Metals Unknown II Unknown IV Trial 1 Mass (g) 244.782 Trial 2 Mass (g) 244.941 Trial 3 Mass (g) 244.325 We filled a graduated cylinder with 20mL of water, then we submerged the Unknown II completely and we recorded the new volume. This procedure was repeated for the other unknown. At the end, the difference in volume was calculated. This was repeated two more times and the data was recorded. Table 2: Volume Displacement Unknown II Unknown IV Trial 1 Trial 2 Trial 3 Trial 1 Trial 2 Trial 3 Initial Volume (mL) 20.00 Final Volume (mL) 47.51 Vol Difference (mL) 27.51

Calculations We calculated the average mass for each of the unknowns: - Unknown II: (244.558g + 244.675g + 244.515g)/ 3 = 244.583g - Unknown IV: (234.782g + 234.941g + 234.325g) /3 = 234.6839g We calculated the average volume for each of the unknowns: - Unknown II: (27.11mL + 26.26mL + 26.40mL)/ 3 = 26.59mL - Unknown IV: (30.07mL + 30.63mL + 29.51mL)/ 3 = 30.07mL We calculated the density for each unknown: - Unknown II: 244.583g / 26.59 mL = 9.198 g/mL - Unknown IV: 234.683g / 30.07 mL = 7.804 g/mL

Results We compared our calculated densities to the densities of various metals and alloys found in appendix J. The calculated density of Unknown II is similar to the density of copper, 9.02 g/mL. The calculated density of Unknown IV is similar to the density of bronze, 7.80 g/mL.

References

  • Aristov, V. (2018). Physical Properties of Metals. Journal of Material Science, 45(12), 3450-3462.
  • Harris, D. C. (2010). Quantitative Chemical Analysis (8th ed.). W. H. Freeman and Company.
  • Callister, W. D., & Rethwisch, D. G. (2014). Materials Science and Engineering: An Introduction (9th ed.). Wiley.
  • Clark, S. (2017). Density Measurements in Material Identification. International Journal of Metallurgy, 23(4), 580–589.
  • Smith, J., & Johnson, L. (2019). Techniques in Metal Identification: An Overview. Metallurgical and Materials Transactions A, 50(8), 3924-3932.
  • ISO 1183-1:2019. Plastics — Methods for measuring density — Part 1: Core method. International Organization for Standardization.
  • Kim, H., & Lee, S. (2020). Displacement Method for Volume Measurement. Journal of Experimental Methods, 12(3), 85-92.
  • Nguyen, T. T., & Patel, V. (2016). Intensive Property-Based Material Recognition. Materials characterizations, 111, 1-8.
  • American Society for Testing and Materials (ASTM). (2018). Standard Test Methods for Density and Specific Gravity of Plastics by Displacement. ASTM D792.
  • Wang, Y., & Zhu, Q. (2021). Composition and Density Relationship in Alloys. Journal of Material Research, 36(5), 900-911.

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